Elenco Circuit Maker Sound Plus 200 - Manual (Page 31)

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Project #49
Project #51
Make
Another
Battery
Build the circuit, then connect points Y & Z (use a 2-snap
wire) for a moment. Nothing appears to happen, but you
just filled up the 100mF capacitor (C4) with electricity.
Now disconnect Y & Z and instead touch a connection
between X & Y. The red LED (D1) will be lit and then go
out after a few seconds as the electricity you stored in it
is discharged through the LED and resistor (R2).
Make Your Own
Battery
Place the 100mF capacitor (C4) back into
the circuit. Now replace the 1KW resistor
(R2) with the 100W resistor (R1) and try it.
The LED (D1) gets brighter but goes out
faster because less resistance allows the
stored electricity to dissipate faster.
You can also change the resistor to the
5.1KW resistor (R3). The LED will be
dimmer but stay on longer.
In the preceding circuit, replace the 100mF
capacitor (C4) with the 10mF capacitor (C3)
and repeat the test. You see that the LED
(D1) only lights for a moment, because the
10mF capacitor does not store as much
electricity as the 100mF.
The 0.1mF capacitor (C2) stores very little
electricity, so if you replace the 10mF capacitor
with it then the LED will not light at all.
Project #50
Make a Small
Battery
Turn the switch (S1) on and you
hear the sound of a bomb
dropping and then exploding. The
LED (D1) lights and then flashes
as the bomb explodes. This is one
sound generated from the space
war IC (U3).
Project #52 Bomb Sound
Notice that a capacitor is not very
efficient at storing electricity - compare
how long the 100mF kept the LED lit for
with how your batteries run all of your
projects! That is because a capacitor
stores electrical energy while a battery
stores chemical energy.
CM-200_Manual_031914.qxp_CM-200_Manual_031914 4/2/14 12:04 PM Page 31